Emily Theresa Russell, Baroness Ampthill, VA (9 September 1843 – 22 February 1927) was a British courtier.

Born Lady Emily Theresa Villiers, she was the third daughter of George Villiers, 4th Earl of Clarendon and his wife, Katherine. She was a bridesmaid to Princess Alexandra of Denmark on the latter's marriage to the Edward, Prince of Wales in 1863.

On 5 May 1868, she married Odo Russell (son of Lord George Russell) at Watford and they later had six children:

• Hon. Arthur Oliver Villiers Russell, later 2nd Baron Ampthill (1869-1935)
• Hon. Odo William Theopilus Villiers Russell (1870-1951)
• Hon. Constance Evelyn Villiers Russell (1872-1942)
• Hon. Victor Alexander Frederick Villiers Russell (1874-1965)
• Hon. Alexander Victor Frederick Villiers Russell (1874-1965)
• Hon. Augusta Louise Margaret Romola Villiers Russell (1879-1966)

In 1881, Odo was created Baron Ampthill. In 1885, the now Baroness Ampthill was appointed a Lady of the Bedchamber to Queen Victoria and was later appointed to the Royal Order of Victoria and Albert for her services.